/**
* @INTERNAL
* Read data from the SPI4000.
*
* @param interface Interface the SPI4000 is on. (0 or 1)
* @param address Address to read from
*
* @return Value at the specified address
*/
static uint32_t __cvmx_spi4000_read(int interface, int address)
{
int status;
uint64_t data;
cvmx_twsix_write_ia(0, SPI4000_TWSI_ID(interface), SPI4000_READ_ADDRESS_HIGH, 2, 1, address);
status = cvmx_twsi_read8(SPI4000_TWSI_ID(interface), SPI4000_DO_READ);
while ((status == 1) || (status == 0xff))
status = cvmx_twsi_read8(SPI4000_TWSI_ID(interface), SPI4000_GET_READ_STATUS);
if (status)
{
cvmx_dprintf("SPI4000: read failed with %d\n", status);
return 0;
}
status = cvmx_twsix_read_ia(0, SPI4000_TWSI_ID(interface), SPI4000_READ_DATA0, 4, 1, &data);
if (status != 4)
{
cvmx_dprintf("SPI4000: read failed with %d\n", status);
return 0;
}
return data;
}
/**
* Reads bytes from eeprom and copies to DRAM.
* Only supports address size of 2 (16 bit internal address.)
*
* @param chip chip address
* @param addr internal address
* @param alen address length
* @param buffer memory buffer pointer
* @param len number of bytes to read
*
* @return 0 on Success
* 1 on Failure
*/
int i2c_read(uchar chip, uint addr, int alen, uchar * buffer, int len)
{
unsigned int bus;
#ifdef CONFIG_I2C_MULTI_BUS
bus = gd->ogd.current_i2c_bus;
#else
bus = 0;
#endif
debug("%s: Reading device: %#04x address %#04x.\n"
" alen=%d, len=%d", __func__, chip, addr, alen, len);
if (alen > 2 || !buffer || !len)
return (1);
while (len--) {
uint64_t data;
int tmp;
tmp = cvmx_twsix_read_ia(bus, chip, addr++,
1, alen, &data);
if (tmp < 0)
return (1);
*buffer++ = (uchar) (data & 0xff);
}
return (0);
}